Add module discovery and autoloading to expect_tests.

scripts/slave/unittests/expect_tests/cover.py

Index: scripts/slave/unittests/expect_tests/cover.py
diff --git a/scripts/slave/unittests/expect_tests/cover.py b/scripts/slave/unittests/expect_tests/cover.py
index 0180e1fc8a465d266eb841c329fd53efdb37cdb6..14b03a7503561f411c1d9568dbf25219b5366486 100644
--- a/scripts/slave/unittests/expect_tests/cover.py
+++ b/scripts/slave/unittests/expect_tests/cover.py
@@ -36,7 +36,7 @@ class _Cover(object):
 
 
 class CoverageContext(object):
-  def __init__(self, name, cover_branches, html_report, enabled=True):
+  def __init__(self, cover_branches, html_report, enabled=True):
     self.opts = None
     self.cov = None
     self.enabled = enabled
@@ -45,7 +45,7 @@ class CoverageContext(object):
 
     if enabled:
       self.opts = {
-        'data_file': '.%s_coverage' % name,
+        'data_file': '.expect_tests_coverage',
         'data_suffix': True,
         'branch': cover_branches,
       }